I think the worst thing I (well, friends) ever did was more gross than creepy. There was this guy and he was annoying, everyone hated him but he kept coming to parties he wasn't invited to and stuff like that. Whenever he was there he would always beg people for cigarettes... Now I don't smoke but I can imagine everyone getting pissed because of that.
So me and some friends decided to pull a prank on him. Now this is incredibly gross, they made a cigarette out of bodyhair. You can guess what kind of bodyhair. They put everything in a cigarette with just a little bit of tabacco sticking out, and we gave it to him. He smoked the whole thing and didn't suspect anything even though it smelled like hell. xD
In the end we confessed and he found out. He wasn't even angry or anything like that. xD
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nooo it was at a woolworths so it was a woolworths outside wall lllooool and yea gruian i did :D